CN111397035B - Air conditioning system for textile mill and working method thereof - Google Patents
Air conditioning system for textile mill and working method thereof Download PDFInfo
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- CN111397035B CN111397035B CN202010131591.1A CN202010131591A CN111397035B CN 111397035 B CN111397035 B CN 111397035B CN 202010131591 A CN202010131591 A CN 202010131591A CN 111397035 B CN111397035 B CN 111397035B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/02—Ducting arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
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Abstract
An air conditioning system for a textile mill and a working method thereof comprise an air inlet pipe, a heat and humidity treatment device, a public main air duct and an air supply system, wherein the air inlet pipe, the heat and humidity treatment device, the public main air duct and the air supply system are sequentially connected, and the air supply system is arranged at the top in a workshop of the textile mill; the air supply system comprises a plurality of air distribution channels, fans, branch air channels, air supply outlets and variable air volume tail end air valves, the air distribution channels and the fans are the same in number, the common main air channel is communicated with the air distribution channels, and the air distribution channels are connected with the fans in a one-to-one correspondence manner; the fan is connected with the plurality of branch air channels, the tail end of each branch air channel is provided with an air supply outlet, and an air valve at the tail end of the variable air volume is arranged at the air supply outlet. The air conditioning system for the textile mill and the working method thereof have the advantages of large air supply amount, long air supply distance, high operation efficiency, contribution to uniformity of air supply, optimization of operation energy consumption of the air supply system and wide application prospect.
Description
Technical Field
The invention belongs to the technical field of air conditioning air systems, and particularly relates to an air conditioning air system for a textile mill and a working method thereof.
Background
With the rapid development of society and the continuous improvement of living standard of people, the textile industry of China is rapidly increased, the textile workshop is also continuously expanded, and the occurrence of the spinning workshop with hundreds of thousands of spindles is very frequent, so that great test is provided for an air conditioning system of the weaving workshop of the textile mill.
In order to control the pollutants in the factory building and ensure the requirements of cleanliness, temperature and humidity, pressure gradient and the like in the production process, the textile mill needs to strictly control the filtration efficiency of the air filter and the air treatment process, and also needs to ensure that the air supply and exhaust volume sent to each controlled space is not interfered by other factors in the system so as to keep the stability of the pressure difference between the controlled environment and the outside. In addition, in the operation process of the air conditioning system in the textile mill, the resistance of the filter is continuously increased, the working efficiency of equipment such as an air feeder and an exhaust fan is continuously changed, the nonstandard manual operation in the operation process of the system and the like can influence the air output and the pressure difference of a factory building. In addition, due to the special technological process of a textile workshop and the strict requirements of the textile on the temperature and the humidity, if the temperature and the humidity are improperly controlled, the quality of the textile cannot meet the requirements, the workshop is prone to flying when air supply of an air conditioner is uneven, cotton fibers scattered in the air can threaten the health of workers, and in addition, due to the large number of fans of a textile factory, huge energy consumption can be caused.
Therefore, the air conditioning system for the textile mill and the working method thereof are researched, the temperature and humidity control and the air supply stability of the weaving mill are improved, energy is saved, and the environment is protected, so that the air conditioning system has very important functions and significance for the textile industry and the physical health of operators.
The Chinese patent application No. CN201810344269.X discloses an air-conditioning air system capable of reducing operation energy consumption, which is used for solving the problem that the existing air-conditioning system still needs to be in an operation state in a transition season, the air-conditioning air system is used in the transition season without starting the operation refrigeration system, the indoor temperature can be reduced only by outdoor fresh air, and the air-conditioning air system is not designed for a textile factory and is not improved and improved in overall operation, air supply uniformity and huge energy consumption.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects, the invention aims to provide the air conditioning air system for the textile mill and the working method thereof, the air conditioning air system has the advantages of large air supply amount, long air supply distance, high operation efficiency and contribution to the uniformity of air supply; the working method is simple, convenient to maintain, stable, reliable and high in flexibility, the requirement of each area of a weaving workshop of a textile mill on air quantity can be met, the operation energy consumption of the fan can be optimized, and the application prospect is wide.
The purpose of the invention is realized by the following technical scheme:
an air conditioning system for a textile mill is characterized by comprising an air inlet pipe, a heat and humidity treatment device, a public main air duct and an air supply system, wherein the air inlet pipe, the heat and humidity treatment device, the public main air duct and the air supply system are sequentially connected, and the air supply system is arranged at the top in a workshop of the textile mill; the air supply system comprises a plurality of air distribution channels, fans, branch air channels, air supply outlets and variable air volume tail end air valves, the air distribution channels and the fans are the same in number, the common main air channel is communicated with the air distribution channels, and the air distribution channels are connected with the fans in a one-to-one correspondence manner; the fan is connected with the plurality of branch air channels, the tail end of each branch air channel is provided with an air supply outlet, and an air valve at the tail end of the variable air volume is arranged at the air supply outlet.
The air conditioning system for the textile mill adopts a mode that a plurality of fans are not completely connected in parallel, mixed gas directly flows into a common main air duct after entering the heat and humidity treatment device through an air inlet pipe, is fed into each branch air duct through the fans at the inlets of the branch air ducts after being divided into air, is fed into an area in a workshop of the textile mill through each air supply outlet in each branch air duct, and controls the air supply quantity in real time according to the change of load in the workshop of the textile mill by the variable air quantity end air valve so as to optimize the operation energy consumption of the air supply system.
The air conditioning system adopted in the weaving workshop of a textile mill has the following advantages: (1) the air supply volume is large: the mode of parallel connection of multiple fans is adopted, so that the total air volume of a pipe network is increased compared with the traditional single fan air supply system, and more air can be conveyed to a weaving workshop; (2) the air supply distance is long: each fan is independently and completely responsible for pressure loss of the common main air duct and the respective branch air duct, the fans are arranged at inlets of the branch air ducts, the air supply distance is long, and the air supply system is suitable for large-space weaving workshops; (3) the operation efficiency is high: when the cold and wet load of a weaving workshop is small or part of equipment runs, the air supply system of the single fan is only subjected to throttling adjustment, so that the fan is easy to deviate from a high-efficiency running section, the efficiency of the fan is reduced, and the energy is wasted; in the multi-fan parallel operation mode, some fans can be turned off when the condition is met, so that other fans can still operate in a high-efficiency working condition section, and the waste of energy is reduced; because the weaving workshops of the textile mill are large in number, each workshop needs at least one set of air conditioning system, and the number of the fans is large, the energy for efficient operation and saving of the fans is considerable; (4) the uniformity of the air supply is benefited: each branch air channel can independently adjust an air volume end air valve, and compared with a traditional single fan and a completely parallel air supply system, each branch air channel can be adjusted more flexibly, and the air supply uniformity of each area can be ensured more easily; (5) the repair is convenient: when a certain fan breaks down, the fan branch pipe section can be independently closed for maintenance, other fans can continue to work, the temperature and humidity of the whole textile workshop are not out of control due to the fact that the whole air conditioning air system is closed, and the quality of products and the working efficiency can be better guaranteed.
Further, in the air conditioning system for the textile mill, the variable air volume end air valve comprises a valve body, a valve core and a valve rod; the valve body sequentially comprises an inlet cylindrical section, a conical contraction section, a cylindrical throat part, a conical diffusion section and an outlet cylindrical section from left to right; the initial position of the valve core is positioned between the inlet cylindrical section and the conical contraction section and is horizontally arranged in the valve body through the valve rod, and a telescopic spring is installed in the valve core.
The variable air volume tail end air valve is arranged at the air supply port, has a simple structure, and has the advantages of high air volume control precision, short response time, large adjustable ratio and capability of realizing pressure-independent adjustment in a large pressure range. The valve body is sequentially arranged into an inlet cylinder section, a conical contraction section, a cylindrical throat part, a conical diffusion section and an outlet cylinder section from left to right, so that the minimum working pressure can be reduced, and the lower working static pressure means that the fan only needs to provide lower power, thereby having important significance for the energy conservation of the system.
Further, in the air conditioning system for the textile mill, the spring is a cylindrical helical compression spring; and the valve body is provided with a TX silencer.
The TX silencer is arranged on the valve body, so that the radiation noise at the air supply opening can be effectively reduced.
Further, the working method for the air conditioning system of the textile mill comprises an opening control method of an air valve at the tail end of variable air volume and a rotating speed control method of a fan.
The air conditioning system adjusts the air output of each area of the weaving workshop of the textile mill through the interaction of the fan, the air duct pipe network (the common main air duct, the branch air duct and the branch air duct) and the variable air volume end air valve, so as to meet the control requirement of the temperature in the weaving workshop. The fan is power equipment of the system, the total air output of the air conditioning air system is adjusted by changing the rotating speed, the air output of the area to which each variable air output end air valve belongs is adjusted by changing the opening, and the air duct pipe network is a link for connecting the fan and the variable air output end air valve. The coupling relation between the fan and the variable air volume tail end air valve is optimally controlled, the operation energy consumption of an air conditioning air system can be optimized, and the stability and the energy saving performance are ensured.
Further, in the above operating method for the air conditioning system of the textile mill, the method for controlling the opening degree of the variable air volume end air valve includes the following steps:
(1) obtaining an impedance-flow balance equation based on the pressure and flow balance relation of an air duct pipe network consisting of a common main air duct, a branch air duct and a branch air duct, and establishing an impedance-flow balance model of the air-conditioning air system;
(2) setting the air volume of each tail end air supply outlet (44) according to the impedance-flow balance model of the air conditioning air system, taking the minimum impedance of the variable air volume tail end air valve as an optimization target, and taking the set balance relation between the air volume and the air volume as a constraint condition to establish a distributed optimization model of the variable air volume tail end air valve;
(3) and solving the distributed optimization model based on a distributed iterative algorithm to obtain the optimal valve position state of the variable air volume terminal air valve meeting the air volume constraint condition, and performing real-time control according to the obtained optimal valve position state of the variable air volume terminal air valve.
The method for controlling the opening of the variable air volume terminal air valve has good stability, loop coupling in PID control is avoided, the optimization algorithm always ensures that at least one variable air volume terminal air valve is in a full-open state, the impedance of the air-conditioning air system can be ensured to be at a lower level, and the energy consumption of an air duct pipe network can be reduced.
For any node in the fluid network, the algebraic sum of the flow rates of the fluid flowing into or out of all pipelines of the node is called as a flow balance law; for any circuit in any fluid network, the algebraic sum of the pressure drops across all branches of the circuit is zero, known as the pressure balance law. Therefore, the impedance-flow characteristics of the air duct network are analyzed, the pressure drop of the branch air duct, the air supply quantity of the air supply outlet at the tail end of the branch air duct and the resistance of the branch air duct meet the pressure drop balance relation, an impedance-flow balance equation can be obtained, and an impedance-flow balance model of the air-conditioning air system can be established by adding an air duct network impedance model of a textile mill according to the equation.
Further, in the above operating method for the air conditioning system of the textile mill, the method for controlling the rotating speed of the fan includes the following steps: and under the condition that the air quantity of each tail air supply outlet and the opening of the variable air quantity tail air valve are known, solving the optimized pressure head and the operating rotating speed of the air outlet machine through the impedance-flow balance relation and the characteristic curve of the air outlet machine, and controlling according to the optimized pressure head and the operating rotating speed of the air outlet machine.
Further, in the above working method for the air conditioning system of the textile mill, the solving and calculating process includes:
(1) assuming that the actual air volume of each tail air supply outlet is balanced with the set air volume, the total air volume of the fan is balanced with the total set air volume, and determining a fan pressure head according to the pressure drop relation of any branch;
(2) knowing the air supply quantity of the fan and the pressure head of the fan, and solving the optimized rotating speed in the current state based on the characteristic curve of the fan.
Further, in the above operating method for the air conditioning system of the textile mill, the fan rotation speed control method is implemented on the basis of the variable air volume end air valve opening degree control method.
On the basis of the control method of the opening degree of the air valve at the end of variable air volume, the control method of the rotating speed of the running fan can keep the balance between the outlet air volume of the fan and the total required air volume, not only can meet the requirements of each area of a weaving workshop of a textile mill on the air volume, but also can optimize the running energy consumption of the fan.
Compared with the prior art, the invention has the following beneficial effects:
(1) the air conditioning system for the textile mill adopts a mode of incomplete parallel connection of a plurality of fans, increases the total air volume of a pipe network compared with the traditional single-fan air supply system, can convey more gas for a weaving workshop, has long air supply distance and high operation efficiency, can independently adjust the air volume end air valve of each branch air duct, can more flexibly adjust each branch air duct compared with the traditional single fan and complete parallel air supply system, is easier to ensure the air supply uniformity of each area, and is convenient to repair;
(2) the working method for the air conditioning system of the textile mill, disclosed by the invention, is simple in working method, convenient to maintain, stable, reliable and high in flexibility, can meet the air volume requirement of each area of a weaving workshop of the textile mill, can also optimize the operation energy consumption of a fan, and has a good practical application effect and a wide application prospect.
Drawings
FIG. 1 is a schematic overall layout of an air conditioning system for a textile mill according to the present invention;
FIG. 2 is a schematic structural diagram of a variable air volume end air valve for an air conditioning system of a textile mill according to the present invention;
in the figure: the air duct 1, the heat and moisture treatment device 2, the common main air duct 3, the air supply system 4, the branch air duct 41, the fan 42, the branch air duct 43, the air supply outlet 44, the variable air volume end air valve 45, the valve body 451, the inlet cylindrical section 4511, the conical contraction section 4512, the cylindrical throat 4513, the conical diffusion section 4514, the outlet cylindrical section 4515, the valve core 452, the valve rod 453, the spring 454, the TX silencer 455 and the weaving workshop a of the textile factory.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to specific experimental data and accompanying drawings 1 to 2, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the following embodiments provide an air conditioning system for a textile mill, which includes an air inlet pipe 1, a heat and humidity processing device 2, a common main air duct 3, and an air supply system 4, wherein the air inlet pipe 1, the heat and humidity processing device 2, the common main air duct 3, and the air supply system 4 are connected in sequence, and the air supply system 4 is arranged at the top in a workshop of the textile mill; the air supply system 4 comprises air dividing channels 41, fans 42, branch air channels 43, air supply ports 44 and variable air volume tail end air valves 45, wherein the air dividing channels 41 and the fans 42 are provided with a plurality of air dividing channels, the number of the air dividing channels 41 and the number of the fans 42 are the same, the common main air channel 3 is communicated with the air dividing channels 41, and the air dividing channels 41 are correspondingly connected with the fans 42 one by one; one fan 42 is connected with a plurality of branch air channels 43, the tail end of each branch air channel 43 is provided with an air supply opening 44, and an air quantity variable tail end air valve 45 is arranged at the air supply opening 44.
Further, as shown in fig. 2, the variable air volume end air valve 45 includes a valve body 451, a valve core 452, and a valve stem 453; the valve body 451 comprises an inlet cylindrical section 4511, a conical contraction section 4512, a cylindrical throat 4513, a conical diffusion section 4514 and an outlet cylindrical section 4515 from left to right in sequence; the valve core 452 is located between the inlet cylindrical section 4511 and the conical contraction section 4512 and is horizontally disposed inside the valve body 451 through the valve stem 453, and a spring 454 which can be extended and contracted is installed in the valve core 452.
Further, as shown in fig. 2, the spring 454 is a cylindrical helical compression spring; the valve body 451 is mounted with a TX muffler 455.
Examples
The working method of the air conditioning system for the textile mill comprises an air valve opening control method at the end of variable air volume and a fan rotating speed control method. The fan rotating speed control method is implemented on the basis of an air valve opening control method at the end of variable air volume.
This is because, on the basis of the method for controlling the opening of the variable air volume end air valve 45, the method for controlling the rotating speed of the fan 42 is operated, so that the balance between the outlet air volume of the fan 42 and the total required air volume can be kept, the requirements of various areas of the weaving workshop of the textile mill on the air volume can be met, and the operation energy consumption of the fan 42 can be optimized.
The opening control method of the variable air volume tail end air valve comprises the following steps:
(1) obtaining an impedance-flow balance equation based on the pressure and flow balance relation of an air duct pipe network consisting of the common main air duct 3, the branch air ducts 41 and the branch air ducts 43, and establishing an impedance-flow balance model of the air-conditioning air system;
(2) setting the air volume of each tail end air supply outlet 44 according to the impedance-flow balance model of the air conditioning air system, taking the minimum impedance of the variable air volume tail end air valve 45 as an optimization target, and taking the set balance relation between the air volume and the air volume as a constraint condition to establish a distributed optimization model of the variable air volume tail end air valve 45;
(3) and solving the distributed optimization model based on a distributed iterative algorithm to obtain the optimal valve position state of the variable air volume terminal air valve 45 meeting the air volume constraint condition, and performing real-time control according to the obtained optimal valve position state of the variable air volume terminal air valve 45.
The method for controlling the opening of the variable air volume terminal air valve has good stability, loop coupling in PID control is avoided, the optimization algorithm always ensures that at least one variable air volume terminal air valve is in a full-open state, the impedance of the air-conditioning air system can be ensured to be at a lower level, and the energy consumption of an air duct pipe network can be reduced.
For any node in the fluid network, the algebraic sum of the flow rates of the fluid flowing into or out of all pipelines of the node is called as a flow balance law; for any circuit in any fluid network, the algebraic sum of the pressure drops across all branches of the circuit is zero, known as the pressure balance law. Therefore, the impedance-flow characteristics of the air duct network are analyzed, the pressure drop of the branch air duct 43, the air supply quantity of the air supply outlet 44 at the tail end of the branch air duct and the resistance of the branch air duct 43 meet the pressure drop balance relationship, an impedance-flow balance equation can be obtained, and an impedance-flow balance model of the air-conditioning air system can be established by adding an air duct network impedance model of a textile mill according to the equation.
The fan rotating speed control method comprises the following steps: under the condition that the air volume of each tail end air supply outlet 44 and the opening degree of the variable air volume tail end air valve 45 are known, the optimized pressure head and the operating rotating speed of the fan 42 are solved through the impedance-flow balance relation and the characteristic curve of the fan 42, and control is performed according to the obtained optimized pressure head and the operating rotating speed of the fan 42.
The solving and calculating process is as follows:
(1) assuming that the actual air volume of each tail end air supply outlet 44 is balanced with the set air volume, and the total air volume of the fan 42 is balanced with the total set air volume, determining the pressure head of the fan 42 according to the pressure drop relation of any branch;
(2) knowing the air supply quantity of the fan 42 and the pressure head of the fan 42, the optimized rotating speed under the current state is solved based on the characteristic curve of the fan 42.
The air conditioning system for the textile mill adopts a mode of incomplete parallel connection of a plurality of fans, mixed gas directly flows into a common main air duct 3 after entering a heat and humidity treatment device 2 through an air inlet pipe 1, is delivered into each branch air duct 43 through a fan 42 at the inlet of each branch air duct 43 after being distributed in a branch air duct 41, and is delivered into an area in a workshop of the textile mill through each air supply outlet 44 in each branch air duct 43.
The air conditioning system adopted in the weaving workshop of a textile mill has the following advantages: (1) the air supply volume is large: the mode of parallel connection of multiple fans is adopted, so that the total air volume of a pipe network is increased compared with the traditional single fan air supply system, and more air can be conveyed to a weaving workshop; (2) the air supply distance is long: each fan 42 is independently and completely responsible for the pressure loss of the common main air duct 3 and each branch air duct 43, the fans 42 are arranged at the inlets of the branch air ducts 43, the air supply distance is long, and the air supply device is suitable for large-space weaving workshops; (3) the operation efficiency is high: when the cold and wet load of a weaving workshop is small or part of equipment runs, the air supply system of the single fan is only regulated by throttling, so that the fan 42 is easy to deviate from a high-efficiency running section, the efficiency of the fan 42 is reduced, and the waste of energy is caused; in the multi-fan parallel operation mode, some fans 42 can be turned off when the condition is met, so that other fans 42 can still operate in a high-efficiency working condition section, and the waste of energy is reduced; because the weaving workshops of the textile mill are large in number, at least one set of air conditioning system is needed in each workshop, and the number of the fans 42 is large, the energy saving of the efficient operation of the fans 42 is considerable; (4) the uniformity of the air supply is benefited: each branch air channel can independently adjust an air volume end air valve, and compared with a traditional single fan and a completely parallel air supply system, each branch air channel can be adjusted more flexibly, and the air supply uniformity of each area can be ensured more easily; (5) the repair is convenient: when a certain fan 42 breaks down, the branch air duct 43 of the fan 42 can be independently closed for maintenance, and other fans 42 can continue to work, so that the temperature and humidity of the whole textile workshop are not out of control due to the fact that the whole air conditioning air system is closed, and the quality of products and the working efficiency can be better guaranteed.
According to the working method for the air conditioning air system of the textile mill, the optimal parameters of the rotating speeds of the variable air volume tail end air valve 45 and the fan 42 are obtained by combining the variable air volume tail end air valve opening control method and the fan rotating speed control method, then control and adjustment are carried out according to the obtained optimal parameters, the stability and the energy saving performance of the operation of the air conditioning air system are improved, the air supply volume can be controlled in real time according to the change of the load in a workshop of the textile mill, and the operation energy consumption of the air conditioning air system is optimized.
The specific working method of the invention is many, and the above description is only the preferred embodiment of the invention. It should be noted that the above examples are only for illustrating the present invention, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications can be made without departing from the principles of the invention and these modifications are to be considered within the scope of the invention.
Claims (6)
1. The working method for the air conditioning air system of the textile mill is characterized in that the air conditioning air system of the textile mill comprises an air inlet pipe (1), a heat and humidity treatment device (2), a public main air duct (3) and an air supply system (4), wherein the air inlet pipe (1), the heat and humidity treatment device (2), the public main air duct (3) and the air supply system (4) are sequentially connected, and the air supply system (4) is arranged at the top in a workshop of the textile mill; the air supply system (4) comprises air dividing channels (41), fans (42), branch air channels (43), air supply outlets (44) and variable air volume tail end air valves (45), wherein the air dividing channels (41) and the fans (42) are provided with a plurality of air dividing channels (41) and fans (42) with the same number, the common main air channel (3) is communicated with the air dividing channels (41), and the air dividing channels (41) are connected with the fans (42) in a one-to-one correspondence manner; one fan (42) is connected with a plurality of branch air channels (43), the tail end of each branch air channel (43) is provided with an air supply outlet (44), and an air quantity variable tail end air valve (45) is arranged at the air supply outlet (44);
the working method for the air conditioning air system of the textile mill comprises an opening control method of an air valve at the tail end of variable air volume and a fan rotating speed control method;
the opening control method of the variable air volume tail end air valve comprises the following steps:
(1) obtaining an impedance-flow balance equation based on the pressure and flow balance relation of an air duct pipe network consisting of a common main air duct (3), a branch air duct (41) and a branch air duct (43), and establishing an impedance-flow balance model of the air-conditioning air system;
(2) setting the air volume of each tail end air supply outlet (44) according to the impedance-flow balance model of the air conditioning air system, and establishing a distributed optimization model of the variable air volume tail end air valve (45) by taking the minimum impedance of the variable air volume tail end air valve (45) as an optimization target and taking the set balance relation between the air volume and the air volume as a constraint condition;
(3) and solving the distributed optimization model based on a distributed iterative algorithm to obtain the optimal valve position state of the variable air volume terminal air valve (45) meeting the air volume constraint condition, and performing real-time control according to the obtained optimal valve position state of the variable air volume terminal air valve (45).
2. The working method for the air conditioning system of the textile mill as recited in claim 1, wherein the variable air volume end air valve (45) comprises a valve body (451), a valve core (452) and a valve rod (453); the valve body (451) sequentially comprises an inlet cylindrical section (4511), a conical contraction section (4512), a cylindrical throat (4513), a conical diffusion section (4514) and an outlet cylindrical section (4515) from left to right; the initial position of the valve core (452) is located between the inlet cylindrical section (4511) and the conical contraction section (4512) and is horizontally arranged inside the valve body (451) through the valve rod (453), and the valve core (452) is internally provided with a spring (454) which can stretch and contract.
3. The operating method for an air-conditioning wind system of a textile mill according to claim 2, characterized in that said spring (454) is a cylindrical helical compression spring; the valve body (451) is provided with a TX silencer (455).
4. The operating method for the air conditioning system of the textile mill as set forth in claim 1, wherein the fan rotation speed control method comprises the steps of: and under the condition that the air volume of each tail end air supply outlet (44) and the opening degree of the variable air volume tail end air valve (45) are known, solving the optimized pressure head and the operating rotating speed of the air outlet machine (42) through the impedance-flow balance relation and the characteristic curve of the air outlet machine (42), and controlling according to the obtained optimized pressure head and the operating rotating speed of the air outlet machine (42).
5. The operating method for the air conditioning system of the textile mill as recited in claim 4, wherein the solving and calculating process comprises the following steps:
(1) assuming that the actual air volume of each tail end air supply outlet (44) is balanced with the set air volume, the total air volume of the fan (42) is balanced with the total set air volume, and determining the pressure head of the fan (42) according to the pressure drop relation of any branch;
(2) knowing the air output of the fan (42) and the pressure head of the fan (42), and solving the optimized rotating speed in the current state based on the characteristic curve of the fan (42).
6. The operating method for the air conditioning system of the textile mill as recited in claim 5, wherein the fan rotation speed control method is implemented on the basis of a variable air volume end damper opening degree control method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010131591.1A CN111397035B (en) | 2020-02-28 | 2020-02-28 | Air conditioning system for textile mill and working method thereof |
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| CN111859662B (en) * | 2020-07-17 | 2023-09-22 | 泰州市都瑞堡船舶设备有限公司 | Layout method of uniform velocity tube flowmeter in tail end unit of variable-air-volume air conditioner |
| CN112665171B (en) * | 2020-12-18 | 2022-05-31 | 珠海格力电器股份有限公司 | Pipe groove type air supply system, control method and equipment |
| CN113028613B (en) * | 2021-03-10 | 2022-03-25 | 浙江大学 | Distributed optimization control method of variable air volume system based on rapid ADMM |
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